The River Nile _______ flood large areas, but now the water of it _______ produce electricity.
| A．used to, is used to | B．used to, used to | C．is used to, is used to | D．is used, to used to |
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The River Nile _______ flood large areas, but now the water of it _______ produce electricity.
| A．used to, is used to | B．used to, used to | C．is used to, is used to | D．is used, to used to |
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